chemistry

Kesternich test

Kesternich test is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Kesternich test rather than just read about it. In short: The Kesternich test is a common name for the corrosion test with sulfur dioxide (SO2) under general moisture condensation. This test was developed in 1951 by Wilhelm Kesternich to simulate the damaging effects of acid rain.

Key takeaways

Kesternich test belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Kesternich test to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Kesternich test from memory before moving on to harder problems.

Reference excerpt

The Kesternich test is a common name for the corrosion test with sulfur dioxide (SO2) under general moisture condensation. This test was developed in 1951 by Wilhelm Kesternich to simulate the damaging effects of acid rain. Acid rain and acidic industrial pollutants are corrosive and can degrade coatings and plated surfaces. Kesternich testing, or sulfur dioxide testing, simulates acid rain or industrial chemical exposure to evaluate the relative corrosion resistance of the coating, substrate, or part itself. The test can be used for coatings or for base materials. The test method is defined by various standards, DIN EN ISO 6988, DIN 50018, ASTM G87, ISO 3231, ISO 22479 are the most common. The parts to be tested are placed in a test chamber with a capacity of 300L and exposed to warm, moist air in combination with a certain amount of sulfur dioxide Note: Sulfur is interchangeable with Sulphur and SO2 is the abbreviation for Sulfur/Sulphur Dioxide

Equipment The test chamber has a set volume of 300L. The construction of the inner housing of the chamber and the devices for arranging the samples must be made of inert and corrosion-resistant materials so that there is no reaction between the sample to be tested and the material of the chamber. The SO2 injection can be performed manually or automatically depending on the chamber.

Principle The principle of the test is simple: • A defined amount of distilled or deionized water is poured into the floor pan of the test chamber. • The samples are placed in the chamber above the water level. The door or hood of the chamber is tightly closed and hermetically sealed for safety. • A fixed volume of sulfur dioxide is introduced into the chamber, usually either 1 L (0.33%) or 2 L (0.66%) Volume of SO2. The test is performed in two sections, o Test section 1: 8 hours warm-up to 40±3 °C (relative humidity 100%) o Test section 2: 16 hours cooling to 18 to 28 °C (relative humidity max. 75 %) The test is usually carried out in cycles of 24 hours each.

Caution: The atmosphere containing sulfur dioxide must not be released into the room air.

Evaluation Take samples from the chamber and let them dry in the room air. An initial assessment is made before any corrosion products are removed. When the tested parts are cleaned, the evaluation criteria must be taken into account. Possible characteristics for evaluation: appearance after the test, appearance after removal of the corrosion products, number and size of imperfections, time to first corrosion, loss of mass. The results are described in a test report.

Sources • DIN EN ISO 6988 Metallic and other inorganic coatings - Test with sulfur dioxide with general moisture condensation, March 1997. • DIN 50018 testing in an alternating condensation climate with an atmosphere containing sulfur dioxide, June 1997. • The importance of corrosion test procedures with special consideration of the SO2 test according to DIN 50018, Wilhelm Kesternich, published in Materials and Corrosion Volume 16, Issue 3, pages 193-201, March 1965.

Further reading DIN EN ISO 6988 Metallic and other inorganic coatings - Test with sulfur dioxide with general moisture condensation, March 1997. This standard has been superseded by ISO 22479 and it is only mentioned for bibliographic purposes DIN 50018 testing in an alternating condensation climate with an atmosphere containing sulfur dioxide, June 1997.

References

Worked examples

Example 1 — a first encounter with Kesternich test

Start with the simplest possible case. Write down what Kesternich test claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Kesternich test before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Kesternich test ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Kesternich test

In research: Kesternich test appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Kesternich test in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Kesternich test is common in secondary-school and first-year university syllabi. It links to neighbouring topics Analytical chemistry, Corrosion, so understanding it makes those chapters shorter.
In everyday life: Look for Kesternich test outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Kesternich test in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Kesternich test means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Kesternich test out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Kesternich test in simple terms?

Why does Kesternich test matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Kesternich test?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Kesternich test.